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The example in Listing 10-19 shows how simple it is to map a unidirectional one-to-many mapping using a target foreign key. The DEPT_ID column refers to the table mapped by Employee, and is a foreign key to the DEPARTMENT table, even though the Employee entity does not have any relationship attribute back to Department. Before you use this mapping, you should understand the implications of doing so, as they can be quite negative, both from a modeling perspective and a performance perspective. Each row in the EMPLOYEE table corresponds to an Employee instance, with each column corresponding to some state or relationship in the instance. When there is a change in the row, there is the assumption that some kind of change occurred to the corresponding Employee, but in this case that does not necessarily follow. The Employee might have just been changed to a different Department, and because there was no reference to the Department from the Employee there was no change to the Employee. From a performance standpoint, think of the case when both the state of an Employee is changed, and the Department that it belongs to is changed. When writing out the Employee state the foreign key to the Department is not known because the Employee entity does not have any reference to it. In this case, the Employee might have to be written out twice, once for the changed state of the Employee, and a second time when the Department entity changes are written out and the foreign key from Employee to Department must be updated to point to the Department that is referring to it.

Playing sounds is quite easy using the MMAPI playback functionalities on MIDP 2.0 devices. Some MIDP 1.0 devices also support the MMAPI, so you can just use the same code. Otherwise, you will need to use proprietary vendor-specific APIs, and very likely, you ll need different sound formats. Table 11-2 lists the available proprietary APIs for sound playback. Table 11-2. Proprietary APIs for Playing Sounds

getPosition() getShadow()

TIP Support for unidirectional one-to-many target foreign key relationships was added in JPA 2.0.

javax.microedition.media.Player com.nokia.mid.sound.Sound com.motorola.game.GameScreen com.motorola.game.BackgroundMusic com.motorola.game.SoundEffect com.siemens.mp.media.Player com.siemens.mp.game.Sound com.siemens.mp.game.Melody

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Now that we have discussed how to create entities with compound primary keys, it is not a far stretch to figure out that, as soon as we have a relationship to an entity with a compound identifier, we will need some way to extend the way we currently reference it. Up to this point, we have dealt with the physical relationship mapping only as a join column, but, if the primary key that we are referencing is composed of multiple fields, then we will need multiple join columns. This is why we have the plural @JoinColumns annotation that can hold as many join columns as we need to put into it. There are no default values for join column names when we have multiple join columns. The simplest answer is to require the user to assign them, so, when multiple join columns are used, both the name element and the referencedColumnName element, which indicates the name of the primary key column in the target table, must be specified. Now that we are getting into more complex scenarios, let s add a more interesting relationship to the mix. Let s say that employees have managers and that each manager has a number of employees that work for him. You may not find that very interesting until you realize that managers are themselves employees, so the join columns are actually self-referential, that is, referring to the same table they are stored in. Figure 10-4 shows the EMPLOYEE table with this relationship.

getShape() getTitle() getVisible()

Figure 10-4. EMPLOYEE table with self-referencing compound foreign key Listing 10-20 shows a version of the Employee entity that has a manager relationship, which is manyto-one from each of the managed employees to the manager, and a one-to-many directs relationship from the manager to its managed employees. Listing 10-20. Self-referencing Compound Relationships @Entity @IdClass(EmployeeId.class) public class Employee { @Id private String country; @Id @Column(name="EMP_ID") private int id; @ManyToOne @JoinColumns({ @JoinColumn(name="MGR_COUNTRY", referencedColumnName="COUNTRY"), @JoinColumn(name="MGR_ID", referencedColumnName="EMP_ID")

Listing 11-11 demonstrates how you can play back a TrueTones sound instead of a MIDI sound on Nokia devices. Listing 11-11. Porting the Playback of Sounds //#if polish.audio.midi && (polish.api.mmapi || polish.midp2) import javax.microedition.media.Manager; import javax.microedition.media.Player; //#elif polish.api.nokia-ui import com.nokia.mid.sound.Sound; import java.io.ByteArrayOutputStream; //#endif ... public void playMusic() throws Exception { //#if polish.audio.midi && (polish.midp2 || polish.api.mmapi) Player musicPlayer = Manager.createPlayer( getClass().getResourceAsStream("/music.mid"), "audio/midi"); musicPlayer.realize(); musicPlayer.prefetch();

}) private Employee manager; @OneToMany(mappedBy="manager") private Collection<Employee> directs; // ...

Returns the shape of the marker. Returns the title of the marker. Returns true if the marker is visible and false if it s not. Returns the zIndex of the marker. Sets the marker to be clickable or not. Sets the cursor that will be used when the user holds the mouse pointer over the marker. Sets the marker to be draggable or not. Sets the marker to be able to have a shadow or not.

musicPlayer.start(); //#elif polish.api.nokia-ui InputStream is = getClass().getResourceAsStream("/music.tt"); ByteArrayOutputStream out = new ByteArrayOutputStream(); int read; byte[] buffer = new byte[ 1024 ]; while( ( read = is.read( buffer, 0, 1024 ) ) != -1 ) { out.write( buffer, 0, read ); } Sound sound = new Sound( out.getByteArray(), Sound.FORMAT_TONE ); sound.play( 1 ); //#endif }

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